Spatial heterodyne spectrometer: modeling and interferogram processing for calibrated spectral radiance measurements

Cara P. Perkins; John P. Kerekes; Michael G. Gartley

doi:10.1117/12.2023765

23 September 2013 Spatial heterodyne spectrometer: modeling and interferogram processing for calibrated spectral radiance measurements

Cara P. Perkins, John P. Kerekes, Michael G. Gartley

Author Affiliations +

Proceedings Volume 8870, Imaging Spectrometry XVIII; 88700R (2013) https://doi.org/10.1117/12.2023765
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

This work presents a radiometric model of a spatial heterodyne spectrometer (SHS) and a corresponding interferogram-processing algorithm for the calculation of calibrated spectral radiance measurements. The SHS relies on Fourier Transform Spectroscopy (FTS) principles, and shares design similarities with the Michelson Interferometer. The advantages of the SHS design, including the lack of moving parts, high throughput, and instantaneous spectral measurements, make it suitable as a eld-deployable instrument. Operating in the long-wave infrared (LWIR), the imaging SHS design example included provides the capability of performing chemical detection based on re ectance and emissivity properties of surfaces of organic compounds. This LWIR SHS model outputs realistic, interferometric data and serves as a tool to nd optimal SHS design parameters for desired performance requirements and system application. It also assists in the data analysis and system characterization. The interferogram-processing algorithm performs at- elding and phase corrections as well as apodization before recovering the measured spectral radiance from the recorded interferogram via the Inverse Fourier Transform (IFT). The model and processing algorithm demonstrate results comparable to those in the literature with a noise-equivalent change in temperature of 0.35K. Additional experiments show the algorithm's real-time processing capability, indicating the LWIR SHS system presented is feasible.

Citation Download Citation

Cara P. Perkins, John P. Kerekes, and Michael G. Gartley "Spatial heterodyne spectrometer: modeling and interferogram processing for calibrated spectral radiance measurements", Proc. SPIE 8870, Imaging Spectrometry XVIII, 88700R (23 September 2013); https://doi.org/10.1117/12.2023765

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available